Sodium has 11 electrons arranged in three energy levels. In order to become stable, sodium forms an ion with:
A. no charge.
B. -1 charge.
C. +8 charge.
D. +1 charge.
E. -8 charge.
D
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In the universal ABO blood grouping system, there are four phenotypes - A, B, AB, and O - which are determined by
three different alleles. The presence of three alleles in the ABO blood grouping system is an example of ____.
a. a polymorphism b. genetic drift c. the bottleneck effect d. a dimorphism e. the founder effect
Antihistamines dampen the effect of allergic
reactions by a. blocking the production of histamines. b. blocking the release of histamines. c. blocking the effect of histamines. d. enzymatically destroying the histamines. e. none of these
Which one of the following terms applies to the phylum Cnidaria?
A. radial symmetry B. Parazoa C. triploblastic D. protostome E. pseudocoelomate
In the event of extensive DNA damage in a eukaryotic cell, p53 will
a. stimulate Rb. b. initiate the S phase. c. inhibit DNA repair. d. initiate apoptosis. e. inhibit MDM2 transcription.